CN1760145A - Technique of undercurrent artificial wetland in sequence batch mode for treating sewage - Google Patents

Technique of undercurrent artificial wetland in sequence batch mode for treating sewage Download PDF

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Publication number
CN1760145A
CN1760145A CNA2005100285806A CN200510028580A CN1760145A CN 1760145 A CN1760145 A CN 1760145A CN A2005100285806 A CNA2005100285806 A CN A2005100285806A CN 200510028580 A CN200510028580 A CN 200510028580A CN 1760145 A CN1760145 A CN 1760145A
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hypothallus
water
sewage
batch mode
wetland
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CN1325397C (en
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徐祖信
王晟
李怀正
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00—Technologies for wastewater treatment
    • Y02W10/10—Biological treatment of water, waste water, or sewage

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  • Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
  • Biological Treatment Of Waste Water (AREA)

Abstract

A process for treating sewage by latent stream and artificial nunja includes such steps as distributing the sewage to the cross-section of the artificial nunja made of matrix layers, the sewage flowing downward, acting on microbes, matrix and plant root to be cleaned, continuously feeding sewage to raise the level of clean water, opening an electromagnetic valve to release clean water while lowering to water level, sucking the air into matrix, and repeating said steps. Its advantages are high effect and small area of artificial nunja.

Description

Technique of undercurrent artificial wetland in sequence batch mode for treating sewage
Technical field
The invention belongs to environmental technology field, be specifically related to a kind of technique of undercurrent artificial wetland in sequence batch mode for treating sewage.
Background introduction
Current wetland (artificial swamp technology a kind of) is a kind of typical ecological wastewater processing technology.Because it has that working cost is low, maintenance management is simple, little to the surrounding enviroment influence, can decentralized and miniaturization construction, the Rural areas is very suitable on the outskirts of a town.Through nearly 30 years time, the surperficial not downstream wetland of ponding becomes the main flow direction of current wetland technical development gradually.The downstream wetland has following characteristics:
(1) water distribution system is embedded under the soil layer of wetland surface, realizes the undercurrent water distribution of wetland thus;
(2) water distribution system is tiled in the wetland top substrate layer, sewage is distributed on the wetland horizontal section after, sewage evenly flows downward, water quality is purified in flow process,
(3) water gathering system is tiled in the wetland bottom substrates layer, collects the sewage that is distributed on the wetland horizontal section, and sewage compiles after the main that catchments flows into effluent trough, crosses effluent trough thin plate weir at last and discharges.Effluent trough thin plate weir is used for regulating the wetland phreatic line.
Research shows that with practice in various current wetland forms, the hydraulics of downstream wetland is best, and hydraulic load height and the easiest assurance wetland move under the undercurrent state.But still there is following shortcoming in this technology:
(1) weak effect of having holidays by turns.During the wetland water inlet, the following matrix pores of phreatic line is full of by sewage; (stop into water) during wetland is had holidays by turns, the following matrix pores of phreatic line still is full of the weak effect of having holidays by turns by sewage.
(2) oxygenation capacity is poor.The downstream wetland passes through three the microorganism oxygenations of approach in matrix: plant, preaeration and atmosphere.The downstream wetland almost can not effectively utilize the air reaeration approach, can only be by plant and preaeration to the matrix oxygenation.Studies show that when wetland was handled sanitary sewage, owing to the upper limit of pollution load apparently higher than plant and preaeration oxygenation capacity, plant secretes oxygen and preaeration does not almost influence intramatrical dissolved oxygen concentration.
These two shortcomings make the downstream wetland technology have 3 bottlenecks in popularization: (1) causes matrix to stop up, and choke water on the surface, worsens wetland running environment.Matrix is stopped up the propagation be mainly derived from bacterium in the organic matter held back in the sewage and the matrix, because artificial swamp can not be implemented back flushing, consume so the residual body of the organic matter of these accumulation and bacterium can only decompose by self, the duct in the matrix just can be dredged afterwards.But, because the oxygenation capacity of downstream wetland is poor, in the matrix typical hypoxic/anaerobic environment (DO≤0.1mg/L), the microbiological deterioration organic matter can only carry out by slow with speed, inefficient anaerobism approach, not have sewage to bring the speed of pollutent in fast if hold back organic decomposition rate, and obstruction will take place.(2) because the wetland oxygenation capacity is poor, being typical hypoxic/anaerobic environment in the matrix, is dominant microflora through the monitoring Ammonifying bacteria, and nitrobacteria does not almost have, and is therefore very low to the removal ability of ammonia nitrogen.(3) the downstream wetland must recover the matrix water permeability by having holidays by turns, and on the one hand, because the water in the downstream wetland can not get emptying during having holidays by turns, having reduced has holidays by turns recovers the effect of matrix water permeability; Wheel body has increased the total area of wetland on the other hand, has also just increased cost.
Summary of the invention
The present invention is directed to the shortcoming of existing downstream wetland, propose a kind of technique of undercurrent artificial wetland in sequence batch mode for treating sewage.
The technique of undercurrent artificial wetland in sequence batch mode for treating sewage that the present invention proposes, promptly by water inlet continuously in undercurrent artificial wetland in sequence batch mode, periodically falling to doing process purifies waste water, its concrete steps are: by wetland plant, in the undercurrent artificial wetland in sequence batch mode that hypothallus is formed, cycle is when beginning, sewage is evenly distributed in the artificial swamp section of forming by hypothallus by water distribution system, sewage flows downward, because hypothallus is to fall dried state, be full of air between the hole in the hypothallus, current are non-flowing full state in the matrix duct, sewage fully contacts with air, and and microorganism, matrix and root system of plant effect; Along with sewage constantly flows into, free-water level forms in the hypothallus, and lifting gradually, is in free-water level following water continuation and microorganism, matrix and root system of plant effect; When free-water level rose to set(ting)value, magnetic valve was opened, and the water emptying in the hypothallus between the negative pressure-pumping air admission hypothallus space that produces by water, realizes the hypothallus air reaeration, the sewage disposal end cycle in decline process rapidly.
Among the present invention, set(ting)value is opened the valve height for default, and the effluent trough water level rises to 8～12cm place under the water distribution system, and magnetic valve is opened; The effluent trough water level drops to water gathering system high together, closed electromagnetic valve.
Among the present invention, set(ting)value is default duration of valve opening, and default duration of valve opening is 10～300 minutes, and closing valve time is 1～48 hour.
The undercurrent artificial wetland in sequence batch mode that the present invention proposes, form by water distribution system 2, hypothallus 3, water gathering system 9 and Controlling System, wherein, Controlling System is connected to form by magnetic valve 7 and open and close controlling equipment 12, the water distributor of water distribution system 2 is positioned at 10～15cm place down, hypothallus 3 surfaces, water gathering system 9 is positioned at the bottom of hypothallus 3, the main 10 that catchments in the water gathering system 9 connects magnetic valve 7 by threeway 11 1 ends, the other end connects effluent trough 4 by rising pipe 6, and the surface of hypothallus 3 is aquatic or terrestrial plants 1 of plantation.
Among the present invention, described aquatic or terrestrial plant is the one or more combination of cattail, reed, Canna generalis Bailey, Caulis Miscanthis floriduli, Medulla Junci, parasol grass, giantreed etc.
Among the present invention, hypothallus 3 is made up of engineering sandstone, little gravel, big gravel respectively from top to bottom, hypothallus total thickness according to the different choice of influent quality is 60～120cm, wherein, engineering sandstone thickness is 0～950mm, and particle diameter is 1～15mm, little gravel thickness is 50～100mm, particle diameter is 10～40mm, and big gravel thickness is 100～150mm, and particle diameter is 30～60mm.
Among the present invention, Controlling System is connected to form by magnetic valve 7 and dibit time controller.
Among the present invention, Controlling System is made up of magnetic valve 7 and open and close controlling equipment 12, and effluent trough water level control magnetic valve opens and closes.Set the free-water level co-altitude in effluent trough water level and the wetland matrix, when the effluent trough water level rises to preset high water level, i.e. 8～12cm place under the water distribution system, magnetic valve is opened; When the effluent trough water level drops to default low-water level, promptly with water gathering system when high, closed electromagnetic valve.In order to reduce investment outlay, Controlling System can be made up of magnetic valve 7 and dibit time controller, adopts dibit time controller control magnetic valve to open and close.Default duration of valve opening is 10～300 minutes, and closing valve time is 1～48 hour, and the control magnetic valve opens and closes in setting-up time.
Sewage purification process is finished in hypothallus among the present invention, and the free-water level of sewage in matrix can occupy different positions, is called saturated surface; Its free-water level curve is called phreatic line.The present invention has the following advantages:
1, wetland is intake continuously, makes floor space drop to minimum;
2, the phreatic line height does not stop to change, and can utilize the air reaeration ability to greatest extent, aerobic/anaerobic environment is alternately occurred, thereby improve matrix microbial biomass and activity, builds better microbial reaction environment, improves the ammonia nitrogen removal ability, alleviates and stop up stifled phenomenon;
3, possess the advantage of Continuous Flow wetland and intermittent flow wetland simultaneously, unite two into one;
4, the sewage residence time in the substrate and generic downlink stream wetland is identical, and nitrated ability is strong when having overcome the low phreatic line operation of downstream wetland, but the residence time is short, the contradiction that lacks anaerobic environment;
5, system controls automatically, and operational administrative is easy.
The undercurrent artificial wetland in sequence batch mode that proposes among the present invention is feature with the continuous heaving and dipping of phreatic line, suction atmosphere to the matrix reoxygenation, integrated the advantage of Continuous Flow wetland and intermittent flow wetland, can tens of times ground strengthen wetlands oxygenation capacity, ammonia nitrogen removal efficient is improved more than 5 times, significantly alleviate wetland simultaneously and stop up stifled phenomenon, reduce the floor space of wetland to greatest extent.This invention has broken through the bottleneck of existing wetland technology, and full automatic control, and operational administrative is very simple.
Description of drawings
Fig. 1 is a structural diagrams of the present invention.
Number in the figure: 1 is wetland plant, and 2 is water distribution system, and 3 is hypothallus, 4 effluent troughs, and 5 are the water outlet weir plate, and 6 is rising pipe, and 7 is magnetic valve, and 8 is phreatic line, and 9 is water gathering system, and 10 for catchmenting main, and 11 are threeway, 12 is open and close controlling equipment.
Embodiment
The invention is further illustrated by the following examples.
Embodiment 1, and undercurrent artificial wetland in sequence batch mode is handled typical urban sewage.Municipal effluent enters undercurrent artificial wetland in sequence batch mode through after the natural sedimentation, wetland plantation reed, and hypothallus total thickness 800mm from top to bottom is respectively: the first layer 0～550mm scope is the engineering sandstone of 1～5mm particle diameter; The second layer 550～650mm scope is the little gravel of 10～30mm particle diameter; The 3rd layer of 650～800mm scope is the big gravel of 30～50mm particle diameter.Minimum operation hydraulic load 0.25m 3/ m 2.d.The cycle of operation is when beginning, municipal effluent is evenly distributed in the artificial swamp section of forming by hypothallus by water distribution system, sewage flows downward, this moment, hypothallus fell dried, be full of air between the hole in the hypothallus, current are non-flowing full state in the matrix duct, sewage fully contacts with air, and with microorganism, matrix and root system of plant effect, sewage constantly flows into, free-water level forms in the hypothallus, and lifting gradually, water continuation below free-water level and microorganism, matrix and root system of plant effect; Magnetic valve is controlled by the time relay, closing valve time 23.5 hours, when reaching default duration of valve opening, magnetic valve is opened, water in 200 minutes in the emptying hypothallus, between the negative pressure-pumping air admission hypothallus space that produces in rapid decline process by water, realize air reaeration, the cycle of operation finishes.Water outlet is better than the secondary discharge standard among the GB18918-2002.
Embodiment 2, the purifying polluted lake water of undercurrent artificial wetland in sequence batch mode.Lake water directly pumps into wetland through the preliminary precipitation district, wetland plantation cattail, and hypothallus total thickness 1000mm from top to bottom is respectively: the first layer 0～750mm scope is the engineering sandstone of 5～15mm particle diameter; The second layer 750～850mm scope is the little gravel of 20～40mm particle diameter; The 3rd layer of 850～1000mm scope is the big gravel of 40～60mm particle diameter.The operation hydraulic load four seasons of wetland differ and alter a great deal, and minimum value is 0.8m 3/ m 2.d.The cycle of operation is when beginning, to pollute lake water by water distribution system and be evenly distributed in the artificial swamp section of forming by hypothallus, sewage flows downward, this moment, hypothallus fell dried, be full of air between the hole in the hypothallus, current are non-flowing full state in the matrix duct, sewage fully contacts with air, and with microorganism, matrix and root system of plant effect, sewage constantly flows into, free-water level forms in the hypothallus, and lifting gradually, water continuation below free-water level and microorganism, matrix and root system of plant effect; In order to tackle the operation hydraulic load of variation, adopt water level feedback control magnetic valve, when rising to the following 200mm of stromal surface, drives the effluent trough water level valve; When dropping to the following 900mm of hypothallus, the effluent trough water level closes valve, water emptying in the hypothallus between the negative pressure-pumping air admission hypothallus space that produces by water, realizes air reaeration in rapid decline process, the cycle of operation finishes, and water outlet is better than the IV class surface water standard among the GB3838-2002.

Claims (7)

1, technique of undercurrent artificial wetland in sequence batch mode for treating sewage, by water inlet continuously in undercurrent artificial wetland in sequence batch mode, periodically falling to doing process purifies waste water, it is characterized in that: by wetland plant, in the undercurrent artificial wetland in sequence batch mode that hypothallus is formed, cycle is when beginning, sewage is evenly distributed in the artificial swamp section of forming by hypothallus by water distribution system, sewage flows downward, because hypothallus is to fall dried state, be full of air between the hole in the hypothallus, current are non-flowing full state in the matrix duct, sewage fully contacts with air, and and microorganism, matrix and root system of plant effect; Along with sewage constantly flows into, free-water level forms in the hypothallus, and lifting gradually, is in free-water level following water continuation and microorganism, matrix and root system of plant effect; When free-water level rose to set(ting)value, magnetic valve was opened, and the water emptying in the hypothallus between the negative pressure-pumping air admission hypothallus space that produces by water, realizes the hypothallus air reaeration, the sewage disposal end cycle in decline process rapidly.
2, technique of undercurrent artificial wetland in sequence batch mode for treating sewage according to claim 1 is characterized in that set(ting)value is to preset to open the valve height, and the effluent trough water level rises to 8～12cm place under the water distribution system, and magnetic valve is opened; The effluent trough water level drops to water gathering system high together, closed electromagnetic valve.
3, technique of undercurrent artificial wetland in sequence batch mode for treating sewage according to claim 1 is characterized in that set(ting)value is default duration of valve opening, and default duration of valve opening is 10～300 minutes, and closing valve time is 1～48 hour.
4, a kind of undercurrent artificial wetland in sequence batch mode, it is characterized in that by water distribution system (2), hypothallus (3), water gathering system (9) and Controlling System are formed, wherein, Controlling System is connected to form by magnetic valve (7) and open and close controlling equipment (12), the water distributor of water distribution system (2) is positioned at 10～15cm place down, hypothallus (3) surface, water gathering system (9) is positioned at the bottom of hypothallus (3), the main that catchments (10) in the water gathering system (9) connects magnetic valve (7) by threeway (11) one ends, the other end connects effluent trough (4) by rising pipe (6), and the surface of hypothallus (3) is the aquatic or terrestrial plant of plantation.
5, undercurrent artificial wetland in sequence batch mode according to claim 4 is characterized in that described aquatic or terrestrial plant is the one or more combination of cattail, reed, Canna generalis Bailey, Caulis Miscanthis floriduli, Medulla Junci, parasol grass, giantreed.
6, undercurrent artificial wetland in sequence batch mode according to claim 4, it is characterized in that hypothallus (3) is made up of engineering sandstone, little gravel, big gravel respectively from top to bottom, the hypothallus total thickness is 60～120cm, wherein, engineering sandstone thickness is 0～950mm, and particle diameter is 1～15mm, little gravel thickness is 50～100mm, particle diameter is 10～40mm, and big gravel thickness is 100～150mm, and particle diameter is 30～60mm.
7, undercurrent artificial wetland in sequence batch mode according to claim 4 is characterized in that Controlling System is connected to form by magnetic valve (7) and dibit time controller.
CNB2005100285806A 2005-08-08 2005-08-08 Technique of undercurrent artificial wetland in sequence batch mode for treating sewage Expired - Fee Related CN1325397C (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101891304A (en) * 2010-07-13 2010-11-24 江西省环境保护科学研究院 Tidal flow constructed wetland with rich reoxygenation
CN101671092B (en) * 2009-10-12 2011-05-18 中国农业大学 Sewage treatment system and method for combined tidal flow artificial wetland
CN102276115A (en) * 2011-07-09 2011-12-14 桂林理工大学 Land strengthening treatment device for domestic wastewater
CN104671421A (en) * 2015-03-05 2015-06-03 吴永贵 Wetting and drying alternation type sewage purification method
CN106430596A (en) * 2016-09-19 2017-02-22 华东师范大学 Buoyancy-adjustable water treatment device and water purification method thereof
CN108285204A (en) * 2018-01-25 2018-07-17 南昌大学 A kind of artificial wet land system of the adaptive discharge of sewage

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1312056C (en) * 2003-09-04 2007-04-25 沈阳环境科学研究院 Polluted water ecological treatment composite process
CN2661680Y (en) * 2003-09-04 2004-12-08 中国科学院沈阳应用生态研究所 Sewage ecological treatment arrangement for artificial wetland
CN100369832C (en) * 2003-10-17 2008-02-20 华南农业大学 Municipal sewage composite artificial wet land denitrifying and dephosphorizing method

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101671092B (en) * 2009-10-12 2011-05-18 中国农业大学 Sewage treatment system and method for combined tidal flow artificial wetland
CN101891304A (en) * 2010-07-13 2010-11-24 江西省环境保护科学研究院 Tidal flow constructed wetland with rich reoxygenation
CN102276115A (en) * 2011-07-09 2011-12-14 桂林理工大学 Land strengthening treatment device for domestic wastewater
CN104671421A (en) * 2015-03-05 2015-06-03 吴永贵 Wetting and drying alternation type sewage purification method
CN106430596A (en) * 2016-09-19 2017-02-22 华东师范大学 Buoyancy-adjustable water treatment device and water purification method thereof
CN108285204A (en) * 2018-01-25 2018-07-17 南昌大学 A kind of artificial wet land system of the adaptive discharge of sewage
CN108285204B (en) * 2018-01-25 2023-10-31 南昌大学 Constructed wetland system capable of self-adapting to sewage flow

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